JP6451501B2 - Vehicle seat - Google Patents

Description

  The present invention relates to a vehicle seat in which a surface (hereinafter also referred to as a seating surface) that supports an occupant is constructed by a planar member stretched over a frame.

  Such a sheet is disclosed in Patent Document 1 below. The seat (seat back) described in Patent Document 1 can adjust the tension of the net member stretched over the frame in the vertical direction and the horizontal direction (width direction).

JP 2012-228899 A

  The technique described in Patent Document 1 is provided with a tension adjusting unit that adjusts the tension in the left-right direction and a tension adjusting unit that adjusts the tension in the vertical direction. Can not.

  An object of the present invention is to enable fine adjustment of a seating surface in a vehicle seat in which a seating surface that supports an occupant is constructed by a planar member stretched over a frame.

In order to solve the above problems, a vehicle seat according to the present invention includes a first frame,
A planar member that supports an occupant is stretched, and includes a second frame supported by the first frame, and a drive unit that changes a relative position of a part of the second frame with respect to the first frame. It is characterized by.

  The second frame has a fixed portion fixed to the first frame, and a displacement portion capable of changing a relative position with respect to the fixed portion, and the driving means is configured to change the position relative to the first frame. It is good to change the relative position of a displacement part.

  The second frame may include a relay portion that is elastically deformable between the fixed portion and the displacement portion.

  The relay portion may include a portion connected to the planar member and a portion not connected to the planar member.

  In a state where the relay portion is not elastically deformed, the relay portion has a wave shape including a convex portion that is convex toward the planar member side and a concave portion that is concave, and one of the convex portion and the concave portion is formed on the planar member. It is good that it is not connected and the other is connected to the planar member.

  The planar member may be connected to the displacement portion.

  The drive means includes a rotating member that is rotated by a driving source, and a cam member that is supported by the rotating member and has a portion that can contact the displacement portion and push out the displacement portion. Good.

  In the vehicle seat according to the present invention, the position of a part of the planar member is displaced by changing the relative position of a part of the second frame with respect to the first frame by the driving means. That is, it is possible to finely adjust the position of the seating surface.

  If a displacement part capable of changing the position with respect to the fixed part fixed to the first frame is provided in the second frame, the displacement part is smoothly displaced by the driving means. That is, the position of the seat surface is adjusted smoothly.

  If the relay part which can be elastically deformed is provided between the fixed part and the displacement part in the second frame, the support function of the planar member by the second frame in a state where the displacement part is displaced by the driving means is excellent. Moreover, the displacement part displaced by the drive means returns to the original state smoothly together with the relay member.

  If the relay portion is configured to include a portion connected to the planar member and a portion not connected to the planar member, a location where the relay portion is not connected to the relay portion when the relay portion is deformed Will grow. That is, it is possible to secure an extension allowance of the planar member whose position is partially changed by the operation of the driving unit, and to reduce the stress generated in the planar member when the driving unit is operated (the planar member Damage is suppressed).

  By adopting a relay portion having a corrugated portion and having a wave shape and a structure capable of changing the magnitude (height) of the “wave”, the elastic deformation function of the relay portion can be ensured. In this case, by adopting a structure in which one of the concave portion and the convex portion is connected to the planar member and the other is not connected to the planar member, the relay member is elastically deformed to reduce the size of the “wave”. It is possible to secure a margin of elongation of the planar member when the apparent length of is increased.

  If the planar member is connected to the displacement part, which is the part displaced by the driving means, a part of the planar member is directly pulled by the moving displacement part. The shape member extends smoothly.

  If the structure is such that the displacement portion is pushed out by the cam member supported by the rotating member, the configuration of the driving means can be prevented from becoming complicated.

It is an external view (cushion material is abbreviate | omitted) of the vehicle seat concerning one Embodiment of this invention. It is an exploded view of the vehicle seat concerning one embodiment of the present invention. It is an external view of the 2nd frame and the planar member stretched over it. (A) is the figure which showed typically the cross section (equivalent to the AA cross section of FIG. 1) of the vehicle seat in the state in which the position of a part of planar member has not changed, (b) FIG. 2 is a view schematically showing a cross section of a vehicle seat (corresponding to a cross section taken along line AA in FIG. 1) in a state in which a part of the planar member is changed in position. (A) is a side view of the vehicle seat in a state where the position of a part of the planar member is not changed, and (b) is the vehicle seat in a state where the position of a part of the planar member is changed. It is a side view. It is the schematic diagram which expanded and showed the connection part of a 2nd frame (a displacement part and a relay part) and a planar member, Comprising: (a) expands and shows the connection part in the state in which the relay part is not elastically deformed. (B) is the figure which expanded and showed the connection part in the state which the relay part elastically deformed.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Unless otherwise specified, the front-rear direction in the following description refers to the traveling / retreating direction (Y direction shown) of the vehicle on which the vehicle seat 1 is mounted, and the up-down direction refers to the up-down direction of the vehicle. The horizontal direction (width direction) is a direction orthogonal to the front-rear direction and the vertical direction, and is a direction based on an occupant seated on the vehicle seat 1 (X shown). Direction). Unless otherwise specified, each direction refers to a direction when the seat back 2 is in a standing state.

  In the vehicle seat 1 according to the present embodiment shown in FIG. 1 as a whole, the seating surface of the seat back 2 that supports the back of the occupant is constructed by a planar member 30. Hereinafter, although the structure of this backrest part is demonstrated in detail, it is also possible to apply the same structure to the seat cushion 3 which is a part which a passenger | crew seats, and the headrest 4 which supports a passenger | crew's head. The vehicle seat 1 according to the present embodiment includes a first frame 10, a second frame 20, and driving means 40.

  A first frame 10 shown in FIGS. 1, 2, 4, and 5 is a main frame constituting a skeleton of a seat. The first frame 10 in the present embodiment is made of metal. The first frame 10 is rotatably connected to a frame (not shown) of the seat cushion 3. A known reclining mechanism or the like is constructed by the first frame 10 and the frame of the seat cushion 3. A plurality of frame mounting portions 11 for fixing the second frame 20 (fixing portion 21), a biasing member mounting portion 12 for fixing the biasing member 43, and a rotating member 41 are freely rotatable on the first frame 10. Is provided with a rotation support portion 13. In addition, each part may be directly formed in the main body of the 1st frame 10, and may be comprised by another member.

  The second frame 20 shown in FIGS. 1 to 5 is a frame-like member on which a planar member 30 constituting a seating surface is stretched. The second frame 20 in the present embodiment is a resin member having a fixed portion 21, a displacement portion 22 and a relay portion 23. The fixing portion 21 is a portion that does not change the relative position with respect to the first frame 10. The fixed portion 21 is connected to the frame attaching portion 11 provided in the first frame 10 so as not to move. Since the connection structure may be anything, the description is omitted.

  A displacement portion 22 is provided for the fixing portion 21 via a relay portion 23. That is, the relay part 23 is provided on both sides of the displacement part 22 in the direction along the longitudinal direction (axial direction) of the second frame 20. The displacement part 22 is a part that receives the force transmitted by the driving means 40. The relay part 23 is an elastically deformable part. Therefore, when force is transmitted to the displacement part 22, the relay part 23 is elastically deformed and the displacement part 22 is displaced. The displacement part 22 in this embodiment has the hook part 221 for hooking the biasing member 43 mentioned later to the back. As will be described later, the hook portion 221 is also a portion with which the cam member 42 contacts.

  The relay part 23 may have any shape as long as it is an elastically deformable part. In the present embodiment, the relay portion 23 is a portion in which an axis that is longer than the fixed portion 21 is formed in a wave shape. That is, the relay portion 23 has a shape in which the concave portions 231 and the convex portions 232 are alternately repeated. When the displacement portion 22 is about to be displaced, the relay portion 23 is elastically deformed so as to reduce the “wave” (to reduce the unevenness). That is, it is elastically deformed so as to approach a straight shape. More specifically, it is elastically deformed so as to increase the apparent length (referring to the length from the end on the fixed portion 21 side to the end on the displacement portion 22 side).

  In the present embodiment, the displacement part 22 (the hook part 221) and the relay part 23 located on both sides thereof are provided so as to be symmetrical in the vertical direction of the second frame 20 and slightly downward. The position of the displacement part 22 and the relay part 23 is a part where the position of the planar member 30 can be changed.

  A planar member 30 is stretched over the second frame 20 having such a configuration. The planar member 30 may be any member as long as it has a certain degree of elasticity and exhibits a sheet shape as a whole that can be stretched over the frame. In the present embodiment, a net (mesh) -like member is used as the planar member 30, but a cloth-like member (without a hole) may be used as the planar member 30. The planar member 30 is connected to the fixed portion 21 of the second frame 20 so as not to move. Any connection structure may be used. You may connect using the member different from the 2nd flame | frame 20.

  The connection structure of the planar member 30 to the displacement part 22 and the relay part 23 of the second frame 20 is as follows. A planar member 30 is connected to the displacement portion 22 (see FIG. 6, a portion indicated by a thick black line in the drawing is a connection portion). That is, when the displacement part 22 is displaced, the part connected to the displacement part 22 in the planar member 30 is also displaced.

  On the other hand, the relay part 23 includes a portion to which the planar member 30 is connected and a portion to which the planar member 30 is not connected. Specifically, the planar member 30 is connected to one of the concave portion 231 and the convex portion 232 of the relay portion 23, but the planar member 30 is not connected to the other. Since the relay portion 23 has a shape in which irregularities are alternately repeated, the portion where the planar member 30 is connected and the portion where the planar member 30 is not connected are alternately present in the longitudinal direction of the relay portion 23. Become. As described above, since the planar member 30 is connected to the displacement portion 22, the entire portion including the displacement portion 22 and the relay portion 23 provided on both sides thereof and the portion where the planar member 30 is connected are planar. It is good to set so that the part to which the member 30 is not connected exists alternately. In the present embodiment, the most displaceable portion 22 side in the relay portion 23 is the recessed portion 231, and thus the planar member 30 is not connected to the recessed portion 231 located next to the displaced portion 22 to which the planar member 30 is connected. First, the planar member 30 is connected to the convex portion 232 (see FIG. 6. A portion indicated by a thick black line in the drawing is a connection portion).

  In the present embodiment, the front side of the second frame 20 is covered with a cushion material 50 (having a pad 51 and a cover 52 covering the same) in order to suppress a decrease in sitting comfort due to the presence of the second frame 20. (Refer to FIG. 4. Note that the cushion material 50 is omitted in FIGS. 1 and 2). However, such a cushioning material 50 is not necessarily provided.

  The driving means 40 shown in FIGS. 1, 2, 4, and 5 is a mechanism for displacing the displacement portion 22 in the front-rear direction. As a mechanism for displacing the displacement portion 22 forward, a rotating member 41 and a cam member 42 are provided. An urging member 43 is provided as a mechanism for displacing the displacement portion 22 backward.

  The rotating member 41 is rotatably supported with respect to the rotation support portion 13 of the first frame 10. That is, it is provided along the width direction. The rotating member 41 may be any member as long as it is a member that rotates when the power of the drive source is transmitted. The rotating member 41 in this embodiment includes a shaft portion 411 and a gear portion 412 fixed to the end portion of the shaft portion 411. When the power of the drive source is transmitted to the gear part 412, the rotating member 41 rotates. Since any power transmission mechanism from the drive source to the gear unit 412 may be used, the description thereof is omitted. The power (drive source) for rotating the rotating member 41 may be an actuator such as a motor, or may be human power.

  The cam member 42 is fixed with respect to the rotating member 41. Any structure for fixing the cam member 42 to the rotating member 41 may be used. In the present embodiment, two cam members 42 are fixed to the shaft portion 411 of the rotating member 41. The distance between the two cam members 42 in the width direction is substantially equal to the distance between the two displacement portions 22 provided in the second frame 20. Each cam member 42 is displaced (rotated) around the rotation center of the rotation member 41. Each cam member 42 has a pressing portion 421 whose distance from the rotation center is farther than other portions. When viewed along the width direction, both cam members 42 overlap. That is, in the two cam members 42 fixed to the rotating member 41, the positions of the pressing portions 421 in the rotating direction are the same.

  The urging member 43 is fixed to the urging member mounting portion 12 of the first frame 10. Specifically, the urging member 43 includes a support portion 431 and a leaf spring portion 432, and the support portion 431 is fixed to the first frame 10. The leaf spring portion 432 has a shape extending straight downward from the support portion 431 in a state where it is not elastically deformed. The leaf spring portion 432 is hooked on the hook portion 221 included in the displacement portion 22 in the second frame 20. The hook portion 221 has a substantially U-shaped (“U” shape) cross section with the front open, and a leaf spring portion 432 is inserted therein. Therefore, the urging force of the leaf spring part 432 is not transmitted as a force that displaces the hooking part 221 (displacement part 22) forward, but is transmitted as a force that displaces the hooking part 221 (displacement part 22) rearward.

  The operation of the vehicle seat 1 according to this embodiment configured as described above will be described. When the driving means 40 is not driven, specifically, when the cam member 42 is not in contact with the displacement portion 22 (the hook portion 221), the second frame 20 is not deformed and is a planar member supported by the second frame 20. 30 is not deformed (see FIGS. 4A and 5A).

  When changing the position of a part of the planar member 30, the power of the drive source is transmitted to the rotating member 41 and the rotating member 41 is rotated. Specifically, the rotation member 41 is rotated so that the pressing portion 421 of the cam member 42 fixed to the rotation member 41 is displaced toward the displacement portion 22 (the hook portion 221). Thereby, the press part 421 of the cam member 42 contacts the displacement part 22 (hook part 221), and pushes the displacement part 22 ahead. Thereby, the displacement part 22 displaces ahead (refer FIG.4 (b) and FIG.5 (b)). Since the fixing part 21 of the second frame 20 is fixed to the first frame 10 (it does not move), the displacement part 22 changes the relative position with respect to the fixing part 21 and the first frame 10. .

  Further, when the displacement portion 22 is displaced forward, the relay portion 23 that connects the displacement portion 22 and the fixed portion 21 is elastically deformed. That is, the apparent length increases as the relay portion 23 is elastically deformed in the direction in which the height of the “wave” decreases and the displacement portion 22 is displaced forward. Since one side of the relay part 23 is connected to the stationary part 21 that does not move, and the other side of the relay part 23 is connected to the displacement part 22, the closer to the displacement part 22 in the relay part 23, the more forward it is. The amount of displacement increases.

  Thus, when the displacement part 22 displaces ahead, the location connected to the displacement part 22 in the planar member 30 will displace ahead. That is, the planar member 30 is pulled by the displacement portion 22. Further, the planar member 30 is also connected to a part of the relay part 23, and at least a part of the relay part 23 is also displaced forward, so that the planar member 30 is also pulled by the relay part 23.

  Here, the relay portion 23 in the present embodiment includes a portion connected to the planar member 30 and a portion not connected to the planar member 30. Therefore, when the relay portion 23 is deformed, a portion of the planar member 30 that is not connected to the relay portion 23 extends. That is, it is possible to secure an extension allowance of the planar member 30 whose part of the position changes due to the operation of the driving means 40, and the stress generated in the planar member 30 is reduced.

  Further, when the relay unit 23 having a wave shape having an uneven portion as in the present embodiment is used, the relay unit 23 is elastically deformed so as to change the magnitude (height) of the “wave”. In that case, when the planar member 30 is connected to both the concave portion 231 and the convex portion 232, when the relay portion 23 tries to extend in the direction of decreasing the “wave” size, the relay portion is caused by the planar member 30. There is a possibility that the elastic deformation of 23 is hindered. On the contrary, the planar member 30 may be forcibly stretched and damaged. In the present embodiment, since one of the concave portion 231 and the convex portion 232 is connected to the planar member 30 and the other is not connected to the planar member 30, the relay portion 23 is elastically deformed and the magnitude of the “wave”. Can be secured, and the allowance for extension of the planar member 30 when the apparent length of the relay portion 23 is increased can be secured (see FIG. 6B).

  In this way, a part of the planar member 30 is pulled forward by the displacement portion 22 and the relay portion 23. In this embodiment, since the displacement part 22 and the relay part 23 are provided so as to be symmetric with respect to the lower side in the vertical direction, the lower part of the planar member 30 is displaced forward. That is, a part of the seating surface is displaced forward (see FIGS. 4 and 5). Thus, in the vehicle seat 1 according to the present embodiment, the position of a part of the planar member 30 is changed by changing the relative position of a part of the second frame 20 with respect to the first frame 10 by the driving means 40. It will be displaced. That is, it is possible to finely adjust the position of the seating surface. Further, for example, when a structure is provided that pushes out the planar member 30 from the rear to the front, the structure that pushes out the planar member 30 becomes a factor that lowers the sitting comfort (provides a sense of foreign matter). In this embodiment, since a part of the second frame 20, that is, a part of the side edge of the planar member 30 is displaced forward, there is no problem that the sitting comfort is lowered. It should be noted that the position where the displacement part 22 and the relay part 23 located on both sides thereof, that is, the position on the seat surface constituted by the planar member 30 can be changed can be changed as appropriate. It is good also as a structure which can change the position of the several place of the planar member 30 (seat surface).

  When returning the planar member 30 to the original state, the rotating member 41 is rotated in the direction to return the cam member 42 to the original state. That is, the state where the displacement portion 22 is pushed out by the cam member 42 is eliminated. In this state, the urging member 43 urges the hooking portion 221 (displacement portion 22) rearward, so that the planar member 30 returns to the original state. In addition, the restoring force of the relay part 23 that has been elastically deformed and the load on the seated occupant also exert an action for returning the planar member 30 to its original state. Therefore, the biasing member 43 for returning the planar member 30 to the original state may not be provided.

  As mentioned above, although embodiment of this invention was described in detail, this invention is not limited to the said embodiment at all, A various change is possible in the range which does not deviate from the summary of this invention.

  In the above-described embodiment, the planar member 30 is connected to the displacement portion 22 and is not connected to the concave portion 231 that is a part of the relay portion 23, but is connected to the convex portion 232. Is merely an example as the most preferable embodiment. If the planar member 30 is not configured to be connected to the entire displacement portion 22 and the relay portion 23, the connection location of the planar member 30 can be changed. For example, the planar member 30 may be connected to the concave portion 231 without being connected to the convex portion 232 of the relay portion 23 (the reverse of the above embodiment). Further, the planar member 30 is connected to a part of the relay portion 23, but may be configured not to be connected to the displacement portion 22.

  The structure of the drive means 40 in the said embodiment is an example to the last. Any device that can displace the displacement portion 22 in the front-rear direction may be used. However, as long as the displacement part 22 can be displaced rearward by the load of the seated occupant, the drive means 40 only needs to be able to displace the displacement part 22 forward. In the above-described embodiment, it has been described that the position of a part of the planar member 30 (seat surface) is changed by displacing the displacement part 22 forward. It is good also as a structure which changes the position of some members 30 (seat surface).

  The displacement part 22 only needs to be displaceable with respect to the fixed part 21. That is, it is only necessary that the second frame 20 can be displaced with respect to the portion fixed to the first frame 10. Although the displacement part 22 in the said embodiment demonstrated that it was a part connected to the fixing | fixed part 21 via the relay part 23 which can be elastically deformed, the structure where the fixing | fixed part 21 and the displacement part 22 were shape | molded as a different body. It is also possible. For example, the displacement portion 22 may be slidable in the front-rear direction with respect to the fixed portion 21, and the displacement portion 22 may be displaced in the direction by the driving unit 40.

  The lifter device 1 according to one embodiment of the present invention can be applied as a seat on which passengers of all vehicles such as automobiles, railways, and aircrafts sit.

DESCRIPTION OF SYMBOLS 1 Vehicle seat 2 Seat back 10 1st frame 20 2nd frame 21 Fixing part 22 Displacement part 221 Hook part 23 Relay part 231 Concave part 232 Convex part 30 Planar member 40 Driving means 41 Rotating member 42 Cam member 421 Press part 43 With Force element

Claims (3)

The first frame,
A second frame supported by the first frame, over which a planar member supporting an occupant is stretched;
Driving means for changing a relative position of a part of the second frame with respect to the first frame;
Equipped with a,
The second frame is
A fixing portion fixed to the first frame;
A displacement part capable of changing a relative position with respect to the fixed part;
An elastically deformable relay portion provided between the fixed portion and the displacement portion;
Have
The drive means changes the relative position of the displacement portion with respect to the first frame,
In a state where the relay portion is not elastically deformed, the relay portion has a corrugated shape including a convex portion that is convex toward the planar member side and a concave portion that is concave.
One of the said convex part and the said recessed part is not connected to the said planar member, The other is connected to the planar member, The vehicle seat characterized by the above-mentioned. The vehicle seat according to claim 1 , wherein the planar member is connected to the displacement portion. The driving means includes
A rotating member that is rotated by a drive source;
A cam member having a portion supported by the rotating member and capable of pushing the displacement portion in contact with the displacement portion;
The vehicle seat according to claim 1 , further comprising:

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